1. PG and Research Department of Physics, Thiru Kolanjiappar Government Arts College, Vriddhachalam, India
2. Centre for Research, Thiruvalluvar University, Serkkadu, Vellore, India
3. Centre for Materials Research, Thiruvalluvar College of Engineering and Technology, Vandavasi, India
4. Centre for Nanoscience and Technology, Anna University, Chennai, India
5. Research Institute of Electronics, Shizuoka University, Johoku, Naka‑ku, Hamamatsu, Japan
6. Department of Physics, Alagappa University, Karaikudi, India